Hi folks, sorry I have come in late to this particular topic but can confirm that the problem with the rise and fall on a TS2000 is most probably due to sawdust accumulation.
I had this problem from a few months after purchasing the saw. I mentioned it to NMA at an exhibition and was advised to get a dust extractor.
After looking round and foolishly trying to find one extractor which would handle all my dust and chip extraction needs, I bought a Record extractor.
This seemed to improve the situation somewhat although I found that I had to turn the saw upside down, and spray a lot of WD40 or equivalent onto the mechanism to release the rise and fall.
Eventually, I became very annoyed with this aspect of the saw although I can't fault much else on it.
In desperation, I took it to NMA one morning (I work about 5 miles away from their place in Brighouse)and explained the problem.
After an hour or so with compressors and extractors (no WD40 etc) and with a huge pile of dust on the floor (talk about embarrassing!), the rise and fall was working as sweet as anything. Cost me £30 ish but I now know what the problem is and, more importantly, how to fix it.
I have now picked up a second hand compressor and use it regularly to blow the sawdust out of the mechanism. I also bought a 1 week old Sheppach dust extractor from NMA (whilst I was there - it had been used for one show and I got it at a very good price!). It's a lot better than the Record for the table saw and P/T. I use the Record with hand power tools these days.
Now the rise and fall problems have virtually disappeared. If the mechanism ever feels to be tightening up, a few seconds blow from the compressor and its free again.